[Bug 1853735] Re: grub2 fails to load with DP1.2 (but not DP1.1)
This seems like an issue with NVIDIA's legacy BIOS VESA ROM. Perhaps try UEFI boot, which is likely less buggy on modern VGA cards. I doubt we will be able to do much unless someone with affected hardware can submit a patch. ** Changed in: grub2 (Ubuntu) Status: Confirmed => Won't Fix -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1853735 Title: grub2 fails to load with DP1.2 (but not DP1.1) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1853735/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1853735] Re: grub2 fails to load with DP1.2 (but not DP1.1)
I'm also affected by this. But in my case the display shows "unconnected cable". If the display is turned off at GRUB load everything goes fine. If the display is turned on, GRUB seems to be stucked -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1853735 Title: grub2 fails to load with DP1.2 (but not DP1.1) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1853735/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1853735] Re: grub2 fails to load with DP1.2 (but not DP1.1)
Status changed to 'Confirmed' because the bug affects multiple users. ** Changed in: grub2 (Ubuntu) Status: New => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1853735 Title: grub2 fails to load with DP1.2 (but not DP1.1) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1853735/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1853735] Re: grub2 fails to load with DP1.2 (but not DP1.1)
I did some research. In fact GRUB2 is unable to load under these conditions: * booting with BIOS (not UEFI) * Nvidia graphics adapter * usage of display port The failure to boot is only observed with GRUB not when Windows boots directly. I guess the graphics adapter is probed at the start of GRUB and fails for some reason. Could please somebody look into this? Some references: https://www.reddit.com/r/linuxquestions/comments/c1r3pu/grub_wont_load_when_connected_to_monitor_via/ https://forum.level1techs.com/t/odd-displayport-grub2-boot- issue/136745/15 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1853735 Title: grub2 fails to load with DP1.2 (but not DP1.1) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1853735/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1853735] Re: grub2 fails to load with DP1.2 (but not DP1.1)
** Description changed: I observed a very strange behaviour and have not found a solution so far: Legacy BIOS GRUB2 (2.02-2ubuntu8.13) Nvidia Quadro K420 ASUS PB27U 4k monitor connected via display port The monitor allows to select DP1.1 (30Hz@4k) and DP1.2 (60Hz@4k) via OSD. With DP1.1 computer boots up normally but it would be required to later change manually to 60Hz. With DP1.2 the BIOS messages (POST) are seen, then a short cursor blink in the left upper corner and the systems halts with a blank screen (I can exclude that grub continues with the boot up process since I cannot ping the machine). I tried: GRUB_GFXMODE "1024*768*8" and GRUB_TERMINAl "console" reinstalling MBR + Always the same picture: DP1.1 no problem, DP1.2 no GRUB. - Always the same picture: DP1.1 no problem, DP1.2 no GRUB. + + One more oddity: If a boot in DP1.1 and then switch the monitor to DP1.2 during GRUB the boot process continues normally and I end with a graphic session 60Hz@4k as intended. + + It appears that only the inital grub2 loading is affected somehow. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1853735 Title: grub2 fails to load with DP1.2 (but not DP1.1) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1853735/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
